Hi
From the FAQ for Sup32
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Q. Which line cards are supported by Sup32?
A. All classic line cards and all CEF256 line cards (without a Distributed Forwarding Card [DFC]) are supported at FCS
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The 6548 & 6516A are CEF256 line cards and are not DFC line cards so you should be okay.
Be aware that because the Sup32 only uses the 32Gbps shared bus the throughput from these cards will be affected by this.
HTH
Jon